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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.1923 Microsoft Security Bulletin MS16-100: Security Update for Secure Boot (3179577) 10 August 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Microsoft Windows Publisher: Microsoft Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2016-3320 Original Bulletin: https://technet.microsoft.com/en-us/library/security/MS16-100 - --------------------------BEGIN INCLUDED TEXT-------------------- Microsoft Security Bulletin MS16-100: Security Update for Secure Boot (3179577) Executive Summary This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow security feature bypass if an attacker installs an affected boot manager and bypasses Windows security features. This security update is rated Important for all supported editions of Windows 8.1, Windows Server 2012, Windows Server 2012 R2, Windows RT 8.1, and Windows 10. Affected Software Windows 8.1 Windows Server 2012 Windows Server 2012 R2 Windows RT 8.1 [1] Windows 10 [2] Windows Server 2012 (Server Core installation) Windows Server 2012 R2 (Server Core installation) [1] This update is only available via Windows Update. [2] Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are available via the Microsoft Update Catalog. Vulnerability Information Secure Boot Security Feature Bypass Vulnerability - CVE-2016-3320 A security feature bypass vulnerability exists when Windows Secure Boot improperly loads a boot manager that is affected by the vulnerability. An attacker who successfully exploited this vulnerability could disable code integrity checks, allowing test-signed executables and drivers to be loaded onto a target device. Furthermore, the attacker could bypass Secure Boot Integrity Validation for BitLocker and Device Encryption security features. To exploit the vulnerability, an attacker who has gained administrative privileges or who has physical access to a target device could install an affected boot manager.The security update addresses the vulnerability by blacklisting affected boot managers. The following table contains links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list: Vulnerability title CVE number Publicly disclosed Exploited Secure Boot Security Feature Bypass Vulnerability CVE-2016-3320 No No - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBV6pjZYx+lLeg9Ub1AQi8KRAAgFMaKoMNXGwOA3AxsRXMFqDAgCs9Gqyc KiQIqByuZa5Mhyuhvv77W79ClPXdy2VLj2WPZd69GNiuxZM3d9S8gEpT0oRBaXrn nI7boJebx1aLTqrz7UG05ef8Z6EDuYEJ1LPFSWWSFAyQya2vQcZsKcJsTg0rEBbZ 66g398tiBVxpc05eKix0i3KYu+iLTZhdtnpl6wU9qPZsiLZbAQY0BHyWm5mLi9WS wFozI3N82JtGebpqJbBwPP+Rwr1sJhsTWOTkdVo0dmKYzfowS8KeDjBjcjKxOJwd sgCJknuIPGzb+UatSH6e02OZycS7blNPPID55LpZusQCWpWYbXnmk2EUNBkr+VV0 KLFY3qlKMAZoxAZWcIvMuPrRDma8rEhZ0DD761copzMebsHdpmquAkNTor63RIy1 0suqM48O0blZMyYI2JUKKAXKBT+myH3K1Y4cyk3MuCHd1ev0TLfMBB2AlRJIfwOX MBIJIEcINQrqWYME0TJma3J1Who5Aih+1xNEnJav/OhRwyMKVQ52OpjQ2i74Czjm ngzQ8l1yYh/NQgHiR9NlfJYEnKNuDyIrI6JKni1qeRYRj7w4KJTTKSG/vkegC2hV iCWIFu9MXmvPGTmHNdQjQyjIvkDyi+BnucYzV6v9n6ObFcpxDmXDoSlBdwD0E7F2 w0SV2FSaSrw= =ivbg -----END PGP SIGNATURE-----